Photographic lamp



R. R. M MATH ETI'AL June 15, 1948.

' PHO'TOGRAPHIC LA P,

2 Sheets-Shet 1 Filed Jan. 12, 1946 1 06a? at e heni the angle for theother end extending slightly beyond the opposite end of the sleeve 2|. Acap 23 is fitted on the last-named end of the sleeve and is clamped tothe tube 22 by a screw 24 passed through the cap and threaded into theouter end of the tube 22.

The sleeve 2! consists of a pair of semi-cylindrical shells 25, eachhaving outwardly extendin flanges 26, 27 at its edges, the flanges 26 ofeach member being secured in surface contact with the flanges 21 of theother member. The flanges 21, lying on opposite sides of the axis ofrotation, are extended laterally in opposite directions as indicated bythe numeral 28 in Fig. 3. The extensions 28 may, if desired, be ribbedat 29 across reinforcement. supports a conventional lamp socket 30.sockets, bein disposed on corresponding surfaces of the extensions andat corresponding points thereof, are related symmetrically with respectto the axis of the trunnion l9.

As shown in Figs. 1 and 3, the sleeve 2| may be provided with a pair ofreflector brackets 3| also disposed symmetrically with respect to theaxis of the trunnion it. These brackets may be secured, for example, tothe respective flanges 21 of the shells 25. The brackets 3| carryreflectors 32 properly arranged with respect to lamps mounted in thesockets 30, as will presently be shown.

One of the sockets carries a lamp A of high intensity on the order of200 watts. This is a conventional or standard incandescent lamp. Theother socket 30 carries a photographic flashlight bulb B.

The result of the described symmetrical arrangement of the lamp socketsand reflectors with respect to the axis of the trunnion I9 is that thelamps A, B, being of similar shape, also have corresponding pointsthereof symmetrically disposed with respect to the axis of rotation ofthe sleeve 2|. The critical requirement, however, is that the respectivecenters of illumination of the lamps be disposed symmetrically withrespect to the axis of rotation of the sleeve 2 i. This condi tion isindicated by the center line X in Fig. 3. Consequently, if the sleeve isrotated 180 from the position shown in Fig. 3, the lamps A and B willoccupy the exact positions formerly held by the lamps B and A. Thereflectors 32' are, of course, positioned for the most elfective andefiibrackets 21, a reflector 40 may be provided with the customarythreaded neck 4| and screwed r directly as shown in Fig. 6 upon thescrew threads 30a provided on the standard lamp sockets 30, the latterbeing the preferred construction.

In the use of the device, the incandescent lamp A with its reflector 32is positioned for the desired illumination of the subject to bephotographed. The adjustment is made by first setting the support orpost Hi, which is usually portable, then adjusting the bracket H, I2 onthe post by the screw I and flnally tightening the bracket I 4, [5 atthe desired angle to the bolt I! by means of the wing nut It as alreadydescribed. The sleeve 2! is held against rotation about the trunnion 19by means of a detent consisting of a, tube 35 mounted diametrically inthe trunnion and hav- Each extension 28 1 The '= an arc of 180 ing aball 36 at each end, the balls being held apart by a coil spring 31. Theballs lodge in seats 38 formed between the inner ends of adjacentflanges 26, 21.

The balls 36, while maintaining the sleeve 2| in an end position, areyieldable to a turning force applied to the sleeve. When theincandescent lamp A has been properly adjusted on the subject, thedevice is swung manually through to bring the flashlight bulb B into theexact focusing position of the lamp A. This position is also maintainedby the detent device. The shutter is then opened, with simultaneousflashing of the bulb B in the usual manner.

It is now evident that practically no time is lost in substituting theflashlight bulb for the incandescent lamp. Slnce the photographer neednot wait for the incandescent lamp to cool and need not unscrew it, nocomplicated manipulation on his part is necessary, and the subject, if aliving one, does not tire and does not impair the desired pose.

While I have shown a satisfactory constructional example of the presentinvention, it will be understood that many changes, variations andmodifications of the specific constructional details may be resorted towithout departing from the spirit of the appended claims.

We claim:

1. A flashead assembly comprising a trunnion, a pair of semi-cylindricalshells rotatably fitted on said trunnion and having outward flanges attheir longitudinal edges, the flanges of each shell being secured to theflanges of the other shell to form a sleeve, each pair of attachedflanges forming a seat in the inner wall of said sleeve, adetent in saidtrunnion adapted to cooperate 2. A. flashead assembly comprising atrunnion, a pair of semi-cylindrical shells rotatably fitted axis ofrotation of said body.

- ROBERT R. McMA'I'H. STEPHEN J. MENZEL.

REFERENCES CITED The following references are of file of thispatent:

UNITED STATES PATENTS record in the

